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Message-ID: <20240228131249.GE292522@kernel.org>
Date: Wed, 28 Feb 2024 13:12:49 +0000
From: Simon Horman <horms@...nel.org>
To: William Tu <witu@...dia.com>
Cc: netdev@...r.kernel.org, jiri@...dia.com, bodong@...dia.com,
tariqt@...dia.com, yossiku@...dia.com, kuba@...nel.org
Subject: Re: [PATCH net-next RFC 1/2] devlink: Add shared descriptor eswitch
attr
On Wed, Feb 28, 2024 at 03:59:53AM +0200, William Tu wrote:
...
> diff --git a/net/devlink/netlink_gen.c b/net/devlink/netlink_gen.c
> index c81cf2dd154f..ac8b0c7105dd 100644
> --- a/net/devlink/netlink_gen.c
> +++ b/net/devlink/netlink_gen.c
> @@ -194,12 +194,14 @@ static const struct nla_policy devlink_eswitch_get_nl_policy[DEVLINK_ATTR_DEV_NA
> };
>
> /* DEVLINK_CMD_ESWITCH_SET - do */
> -static const struct nla_policy devlink_eswitch_set_nl_policy[DEVLINK_ATTR_ESWITCH_ENCAP_MODE + 1] = {
> +static const struct nla_policy devlink_eswitch_set_nl_policy[DEVLINK_ATTR_ESWITCH_SHRDESC_COUNT + 1] = {
> [DEVLINK_ATTR_BUS_NAME] = { .type = NLA_NUL_STRING, },
> [DEVLINK_ATTR_DEV_NAME] = { .type = NLA_NUL_STRING, },
> [DEVLINK_ATTR_ESWITCH_MODE] = NLA_POLICY_MAX(NLA_U16, 1),
> [DEVLINK_ATTR_ESWITCH_INLINE_MODE] = NLA_POLICY_MAX(NLA_U16, 3),
> [DEVLINK_ATTR_ESWITCH_ENCAP_MODE] = NLA_POLICY_MAX(NLA_U8, 1),
> + [DEVLINK_ATTR_ESWITCH_SHRDESC_MODE] = NLA_POLICY_MAX(NLA_U8, 1),
> + [DEVLINK_ATTR_ESWITCH_SHRDESC_COUNT] = NLA_POLICY_MAX(NLA_U32, 65535),
> };
Hi William,
I realise this is probably not central to your purpose in sending an RFC,
but my understanding is that the max value set using NLA_POLICY_MAX
is of type s16, and thus 65535 is too large - it becomes -1.
Flagged by W=1 build with clang-17.
>
> /* DEVLINK_CMD_DPIPE_TABLE_GET - do */
...
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